Dry-pipe valve



VP. EVANS, A. C. ROWLEY AND C. B. GARRETT.

' DRY PIPE VALVE.

APPLICATION FILED MAH. I, 1919.

1,334,847. Patented Mm. 1920.

4 SHEETS-SHEET l.

@gl g M P. EVANS, A. C. HOWLEY AND C. B. GARRETT.

DRY PIPE VALVE.

APPLICATION FILED MAR. l, 1919.

1,334,847. Patented Mar. 2.5, 1920. l 4 SHEETSw-SHEET 2.

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P. EVANS, A. C. ROWLEY AND C. B. GARRETT.

DRY PIPE VALVE.

APPLICATION man MAR.1.1919.

Patented Mar. 23, 1920.

4 SHEETS-SHEET 3.

P. EVANS, A. C. BOWLEY AND C. B. GARRETT.

DRY PIPE VALVE.

APPLICATION man MAR. l, 1919.

Patented Mar. 23, 1920.

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UNITED sTATEs PATENT OFFICE.

PWELL EVANS, ARTHUR C. ROWLEY, AND CHARLES B. GARRETT, OF PHILADELPHIA,

PENNSYLVANIA, ASSIGNORS T0 GLOBE AUTOMATIC PHILADELPHIA, PENN SYLVANIA,v A CORPORATION OF SPRINKLER COMPANY, 0F PENNSYLVANIA.

DRY-PIPE VALVE.

Specification of Letters Patent.

Patented Mar. 23, 1920.

Application filed March 1, 1919. Serial No. 280,097.

To all 'whom it may concern: p l

Be it known that we, POWELL EVANS, ARTHUR C. ROWLEY, and CHARLES 'B. Grin- EE'rT, citizens of the United States, residing in Philadelphia, Pennsylvania, have invented Dry-Pipe Valves, of which the following is a specification. t I

@ne object ot'. our invention is to provide Va relatively simple, compact and substantial torni ot dierential dry pipe valve in which the parts shall be so arranged as to permit ot a direct or straight line flow of water through the valve casing under the predetermined conditions governing its operation ;-the arrangement ot parts being such as to permit ot the convenient and inexpensive manufacture of the apparatus. i

It is further desired to provide a dry pipe valve ot the type above indicated With a novel arrangement and mounting of parts whereby, as long as the air and water valves remain closed, any liquid entering the chamber between said valves is permitted to escape, but when said valves are open so as to permit a flow of liquld through the valve casing, the otherwise open drainage passage is automatically closed.

We further desire to provideA a differential dry pipe valve in which the two movable valve elements directly engage each other under normal conditions during which dow ofliquid is prevented, for which purpose the air valve is constructed and mounted in a novel mannerrelatively to its seat and to the water valve;-the invention further contem lating the provision of an automatic drainage valve controlled by said air valve. A

These objects and other advantageous ends we attain as hereinafter set forth, reference being had to the accompanying draw- 4 ings,'in which,

Figures lfand 2 are vertical longitudinal sections of adry pipe valve constructed according to our invention; showing its movable elements in the posltions occupied under normal and under operating conditions, respectively 5 y j Figs. 3 and 4 are respectively transverse sections on the lines 3-3 and 4-4, Fig. 1;

Fig. 5 is an inverted plan of the supporting arm for theair valve; and

Fig. 6 is a perspective View of the automatic drain-controlling valve with its associated parts.

In the above drawings, 1 represents a valve casing having a bottom inlet 2 and a top outlet 3 axially in line with each other, in addition to which said casing is provided with a transverse partition 4 lying in a plane inclined at an acute angle to the horizontal plane and having in it a circular opening whose center lies in the axial line forming the inlet 2 and outlet 3'. One side of the casing 1 is provided with a relatively large opening 5 entering both of the chambers 6 and 7 on opposite sides of the partition 4 and this is normally closed by a plate 8 held in position by bolts or other suitable means.

The opening from the inlet 2 into the chamber 6 has mounted in it a valve seat 9 designed to coperate with a valve 10 Xed to a forked structure 11 whose arms are pivotally mounted upon a transversely extending pivot bar or rod 12. Said structure includes a transverse web from which arounded' head 13 projects into a correspondingly formed cavity inthe Water valve 10M/'here it is retained by a ring or annular late 14 so as to permit of a slight universa movement of the valve.

The casing 1 is so formed that while the valve 10 may rest upon the seat 9 to close the inlet into the chamber 6, it is free to swing with the structure 11, back on its supporting pivot pin 12 so that it lies wholly to one side of the inlet passage 2.

The opening in the partition 4 has mounted in it a valve seat 15 havin a soft metal face 16 Within thel chamber (7 designed to coperate with an air valve 17. The circular body of this latter has a rubber or other radially projecting ring 18 clamped to it by a retaining ring 19 in such manner as to engage the face 16 of the .valveseat 15 when the valve is closed and this retaining ring is held to the body of the valve by a ysuitable number of screws 20. The valve trally into the latter 4which is held 4from turnmg relatively to said body by a screw or bolt 26 at one side of sa1d central or4 main bolt. The bod 22 of the structure 21 is so formed'that w en the water valve 10 `Pand air valve 17 are in their closed posithe head 13 of the forked structure 11 is` rounded or curved so as to permit a slight relative movement of the water valve 10 such as may be necessary to permit it to properly engage its seat 9, lit is in effect a part of said water valve, and similarly the forked structure 22, being rigidly connected to the air valve 17, constitutes in effect a part thereof.

At the lowest. point of the chamber 6 is provided a drainage opening having mounted therein'a bushing or tubular structure 27 providin a valve seat withinsaid chamber and inc uding an extension.l to which is pivoted a lever 28. The latter at one end carries a valve in the'form of a ball 29 more or less loosely connected toit by av 'screw 30 and at its opposite end is provided with a laterally extended portion 31 of such length as to be engagedby one of the arms 23 of the forked structure 22 when the valve 17 is seated. When so engaged the lever 28 is held in such position that the valve 29 is elevated above the seat structure 27 so that any li uid in the casing 6 may escape therethroug When however the valve 17 becomes unseated, its web 23 releases the lever 28 and' allows the valve -29V to seat itself on the inner end of the bushin 27 so as to prevent further escape of liqui Under conditions of use the inlet 2 is connected to a source of water under pressure and the chamber 7 is connected through the outlet 3 to a sprinkler system containing air maintained under a pressure less than that of the water. The area of the valve 10 exposed to water ressurel in the inlet bears such a ratio to t e area of the valve 17 exposed to the air pressure aswill with the mechanically exerted leverages, predicate a tripping ofthe device, upon such unbalan ing of the forces when, in the case illus' trated, the air pressure falls below one sixth ressure. Under normal ccnl ditions there ore the air pressure is sufil of the water 4'cient to 'hold the air valve closed and through its structure 22 in engagement with the body 11, holds the water valve 10 closed. When however by reason of the o ening of one or more sprinkler heads of t e system connected to the outlet 3, there is a substantial drop of the air pressure in the chamber 7, the valve 17 is raised from its seat b the waterpressure on the valve 10 and 1s swung back on its pivot rod or pin 24 to one sideof the straight passa e through the swings back on its pivot pin 12, while the draina e valve 28 is allowed to automatically c ose by reason of its release by the arm 23, so that water under pressure is free to flow in a straight line from the inlet 2 through the partition opening and the outlet into the sprinkler system.

Whenl after the valve has thus fulfilled its functions the flow of water through it is stopped, the plate 8 is removed, the valves 10 and 17 are successively returned to their seats and air under pressure is admitted to the sprinkler system and to the chamber 7. Tater under pressure is then admitted to the su ply line connected to the inlet 2 so that tg tion ;-the drainage valve 28 bein also held open as above noted by the va ve 17, so

that any water leakin into the chamber 6 w out through the projecting ribs or webs 40 having ends ex'- tended beyond its edge to respectively cooperate with the suitably placed branches of a latch 41 pivotally mounted at one side of the chamber 7, so that under the action of avity it normally rests u on said ribs, which wlth the valve 17 an 'its ring 18, may move a short distance away from the seat ring 16 under the action ofV such changes of the pressure on the water valve 10 as might be caused by water hammer, without being affected by said latch. When however, there is` such a reduction of air pressure in the chamber 7 as permits the valve 17 to rise beyond a predetermined distance from its seat, the latch 41 falls under the ribs 40 and prevents said valve reseatingfwhereupon the flow of water into the chamber 1 through the partially open valve 10 shortly acts on the valve 17 and swings it open.

We. claim:

1. The combination in a differential dry pipe valve' of'a casing having a transverse partition dividing it into chambers and ro' Vvided with an inlet and outlet axiallyI in ine with an opening in said partition; with two valves both pivoted in -one of the chambers in positionsl to control the flow of water through the inlet and throu h the partition opening respectively, said va ves having rtions in direct engagement when in t eir closed ositions.

2. T e combination in a differential dry pipe valve of a casing having a transverse e apparatus is again ready for aclll lill

insana? partition dividing it into two chambers, and provided with an inlet and an outlet axially in line with an inclined opening in said partition; ,with two valves formed to have difterent eiective areas and provided with pivots in one ot the chambers supporting them in positions to control the flow of water through the inlet and through the partition opening respectively, said valves having prtions in direct engagement when in their closed positions.

3. The combination in a differential dry pipe valve ot `a casing having a transverse partition dividing'it into chambers and provided with an inlet, an outlet and an opening in the partition, all in axial alinement; a if'alvepivoted in the chamber between the partition and the inlet for controlling the tlow of water through the inlet; with a second valve having a rigidly connected arm also pivoted in said chamber and havin a portion directly operative on the tiret va ve to hold it closed.

fl. rlhe combination in a diferentia-l dry pipe valve of a casing having a transverse partitiondividing it into two chambers and `provided with an inlet and an outlet axially in line with an opening in saidlpartition; a valve operative in one ot the chambers for closing said partition opening end having rigidly connected to ita structure pivotally mounted in the other chamber; with a second valve pivotally mounted in the latter chambei' and including a relatively adjustable portion directly engaged by said rigidly connected structure of the first valve whereby it is normally retained in a closed position as long as the said lirst valve remains closed.

5. 'lhe combination in a di'erential dry pipe valve ot a casing having a transverse partition dividing it into two chambers and provided with an inlet `and an'outlet axially in line with an opening in said partition; a valve operative in one olf the chambers for closing said partition opening and having rigidly connected to it a structure pivotally mounted in the other chamber; with asecond valve pivotally mounted in the latter chamber and including a portion directly engaged by said supporting structure of the tirst valve whereby it is normally retained in a closed position as long as the tirst valve remains closed. I

t. 'lhe combination in a diderential dry pipe valve of a casing having a transverse partition dividing it into two chambers and provided with an inlet and an outlet axially in line with an opening in said partition; a valve operative in one of the chambers for closing said partition opening and having rigidly connected to it a structure pivotally and outlet; a valve having a peripheral pon.

tion formed to yieldingly engage the marginal portions of the opening in the partition and operative in one of the chambers of the casing formed thereby, said valve including a rigidly connected structure extending into and pivotally mounted in the other chamber; with a valve for the inlet having movably connected to it a structure also pivotally mounted in the second chamber and normally in direct engagement with the supporting structure of the rst valve.

8. The combination in a ditl`erential dry pipe valve ot a casing having an inlet and an outlet; a transverse partition having an opening in line with said inlet and outlet; a valve having its peripheral portion termed to engage the marginal portions ot' the opening in the partition and operative in one oit the chambers ot the casing formed by said partition, said valve including a rigidly connected structure extending into and piv` otally mounted in the other chamber; a valve tor the inlet; a structure movably connected. to the inlet valve also pivotally mounted in the second chamber and normally in direct engagement with the 'supporting structure ot the tirst valve, the seats tor said 'two valves lying in planes at an acute angle to each other.

9. rllie combination in a diliterential dry pipe valve of a casing having an inlet and an outlet; a transverse partition having an opening in line with said inlet and outlet; valves mounted to normally close the inlet and the opening in the partition respectively and both supported in one oit the chambers of the casing termed by said partition, one oit the valves having a pair ot ribs on opposite sides ot one face; with a gravity latch including portions engaging said ribs respectively and termed to prevent reseatin ot said valve after it has risen a predetermined distance from its seat.

ln witness whereof we atlix our signatures.,

PGWELL EVANS. ARTHUR C.. RUWLEY. CHARLES B. ihllttldll.

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